add require, add naive post-install test

Author: defeated

formula.rb

@@ -1,10 +1,16 @@
+require "formula"
+
 class Touchp < Formula
-  desc      "basically `mkdir -p` + `touch`, written in Go"
-  homepage  "https://github.com/defeated/touchp/"
   url       "https://github.com/defeated/touchp/releases/download/0.0.1/touchp-0.1.1-darwin-amd64.zip"
+  homepage  "https://github.com/defeated/touchp/"
+  desc      "basically `mkdir -p` + `touch`, written in Go"
   sha256    "f0275b34d87c624541dd04824815290666bc6de5055632d32d4d154507e27ed0"
 
   def install
     bin.install "touchp"
   end
+
+  test do
+    system "touchp"
+  end
 end